Java-error

Hi!
I have recently installed a plugin (bookingcalendar) on my site with the Simvance-theme. I had some trouble with the plugin and after spoken to support regarding the plugin they said there was some java-error in this theme. I copy the dialogue from the support:
Hello.
You are having this JavaScript error at that page, and thats why you do not see the calendar at the page:

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Error: TypeError: jQuery(…).timeago is not a function
Source: https://lazysailing.no/wp-content/themes/simvance/js/custom.js?ver=3.9.1
Line: 3
This error is because of your actual theme try to load this code:

jQuery(document).ready(function() {
//Set up the Slider
jQuery(“time.entry-date”).timeago();

Its seems that there are no element “time.entry-date” at that page, and that’s why we are having that error.

So please contact with this info the developer of that theme “simvance” about fixing of that JS error.

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So, I wonder if this is possible to fix? I really liked this theme and would be happy to use it if it cooperate with the theme ??

Thanks!